What would I gain from a 4bbl on a 273?

here are pictures of a 1967 dodge dart 273 power pak combo i have for sale for my father.it was on his running volare back in the late 80s early 90s.has been in a trash bag in the shed since.would need cleaned and rebuilt.has the carter afb 4bbl,water neck,fuel line.all include along with factory chrome air breather.would possibly sell a nice set of power pak valve covers if interested.can be contacted at 573-821-6585
jeremy

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